Fermi Large Area Telescope Detection of Gamma-Rays from NGC 6251 Radio Lobe
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arXiv
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| Format: | Preprint |
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2024
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| author | Yu, Yu-Wei Zhang, Hai-Ming Gan, Ying-Ying Hu, Xin-Ke Wu, Tan-Zheng Zhang, Jin |
| author_facet | Yu, Yu-Wei Zhang, Hai-Ming Gan, Ying-Ying Hu, Xin-Ke Wu, Tan-Zheng Zhang, Jin |
| contents | We report on the detection of extended $γ$-ray emission from lobes in the radio galaxy NGC 6251 using observation data of Fermi Large Area Telescope (Fermi-LAT). The maximum likelihood analysis results show that a radio morphology template provides a better fit than a point-like source description for the observational data at a confidence level of 8.1$σ$, and the contribution of lobes accounts for more than 50\% of the total $γ$-ray flux. Furthermore, the $γ$-ray energy spectra show a significant disparity in shape between the core and lobe regions, with a curved log-parabola shape observed in core region and a power-law form observed in lobes. Neither the core region nor the northwest lobe displays the significant flux variations in the long-term $γ$-ray light curves. The broadband spectral energy distributions of both core region and northwest lobe can be will explained with a single-zone leptonic model. The $γ$-rays of core region are due to the synchrotron-self-Compton process while the $γ$-rays from northwest lobe are interpreted as inverse Compton emission of the cosmic microwave background. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_04591 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fermi Large Area Telescope Detection of Gamma-Rays from NGC 6251 Radio Lobe Yu, Yu-Wei Zhang, Hai-Ming Gan, Ying-Ying Hu, Xin-Ke Wu, Tan-Zheng Zhang, Jin High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics We report on the detection of extended $γ$-ray emission from lobes in the radio galaxy NGC 6251 using observation data of Fermi Large Area Telescope (Fermi-LAT). The maximum likelihood analysis results show that a radio morphology template provides a better fit than a point-like source description for the observational data at a confidence level of 8.1$σ$, and the contribution of lobes accounts for more than 50\% of the total $γ$-ray flux. Furthermore, the $γ$-ray energy spectra show a significant disparity in shape between the core and lobe regions, with a curved log-parabola shape observed in core region and a power-law form observed in lobes. Neither the core region nor the northwest lobe displays the significant flux variations in the long-term $γ$-ray light curves. The broadband spectral energy distributions of both core region and northwest lobe can be will explained with a single-zone leptonic model. The $γ$-rays of core region are due to the synchrotron-self-Compton process while the $γ$-rays from northwest lobe are interpreted as inverse Compton emission of the cosmic microwave background. |
| title | Fermi Large Area Telescope Detection of Gamma-Rays from NGC 6251 Radio Lobe |
| topic | High Energy Astrophysical Phenomena Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.04591 |